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How to replace a microwave oven's diode:

Replacing a high voltage diode

The first thing you must do to replace your microwave's diode is unplug the unit from the wall outlet.

Next you will have to discharge the high voltage capacitor. A capacitor stores large amounts of electricity even when the unit is unplugged. It is necessary to discharge the high voltage capacitor in order to avoid receiving an electrical shock.

Diode replacement is relatively straightforward because most high voltage diodes have a press fit, also known as Fast-On, or they have ring lugs. If your replacement diode can be installed either way, make sure you get the right polarity. Remember that a diode will conduct an electrical current when a forward voltage is applied, but when a reverse voltage is applied, there is no conduction.

Remove the diode from your microwave and replace it with the new one. You may be able to crimp the new diode onto the wire leads, without welding or soldering them together. If you do crimp the diode onto the leads, be sure not to apply too much pressure, as this may cause connection problems either now or in the future.

CAUTION: Your microwave oven is capable of giving you a serious electrical shock, even when it is unplugged. We strongly suggest you seek the assistance of an appliance repair technician when conducting any microwave oven repair.